Time-controlled draft-regulating device.



C. H. CARROLL. TIME CONTROLLED DRjAfI REGULATING DEVICE.

APPLICATION mm OCT. 21.

Patented July 3 a mw.

CARL H. CARROLL, OF WEST SOMERVILLE, MASSACHUSETTS.

TIME-CONTROLLED DRAFT-REGULATING DEVICE.

Application filed October 21, 1913.

To all whom it may concern:

Be it known that I, CARL H. CARROLL, citizen of the United States,residing at West Somerville, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inTime- Controlled Draft-Regulating Devices; and I do hereby declare thefollowing to be a full, clear, and exact description of the lnventlon,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to time controlled, draft regulating devices forstoves and furnaces, which may be set in conditlon to allow the draft tobe closed, and which will act to open the draft at a predetermined time.

The object of the invention is to produce a device of this characterwhich is simple in construction and reliable in operation, and which maybe set up and connected with the draftcontrolling mechanism of the stoveor furnace by one whohas very little mechanicalskill.

With this object in view the invention comprises certain novel andimproved constructions, arrangements and combinations of parts, theadvantages of which will be obvious to those skilled in the art from thefollowing description.

In the accompanying drawings illustrating a time controlled draftregulating device embodying the various features of the invention intheir preferred forms, Figure 1. is a view in front elevation of thedevice showing the same connected with the lower door of a furnace; Fig.2 is a detail view, partly in section, illustrating particularly thedevices for supporting the draft operating lever, showing the positionof the parts when the lever is supported in position to allow the draftto be closed; Fig. 3 is a View similar to Fig. 2, showing the positionswhich the parts assume when the draft operating lever is released; andFig. 4 is a detail view showing the construction of the outer end of thespool which is mounted on the end of the draft operating 'lever and ofthe adjacent parts.

The draft operatingdevice illustrated in the drawings comprises asupporting frame indicated at 1, which is adapted tosupport all theparts of the device, and which may be placed in any desiredpositionwithrelation to the heater so that the device may be Specification ofLetters Patent.

lPatented July 3, 1917. Serial No. 796,473.

connected with the draft controlling mechanism of the heater. Pivoted at2 upon this supporting frame is a draft operating lever 3, to one end ofwhich is attached a flexible connector 4 having a snap 5 at its lowerend by which the connector 4 may be connected with the draft controllingmeans of the heater. The lever 3 and the flexible connec tor 4 arearranged and connected with the draft controlling means, so that whenthe lever occupies the position illustrated in F ig. l, the draft of theheater may be closed, and when the lever is swung from the positionillustrated in full lines in Fig. 1 to the posit1on illustrated indotted lines in said figure, the draft controlling means will beoperated to open the draft. As illustrated in the drawings, the flexiblemember 4 is attached at its lower end to the front door 6 of a furnace,which door is located below the firebox or grate. As shown in Fig. 1,the swinging movement of the lever 3 from full line to dotted lineposition swings the door 6 of the furnace outwardly, as clearly shown insaid figure, so as to allow the air to be drawn up through the firebox.A tension coiled spring 7 is attached at its upper endto one end of thelever 3, and at its lower end to the frame 1, and acts to swing thelever 3 from full line to dotted line position. I

When the device is set the lever 3 is sup ported in the full lineposition, Fig. 1. In order that the lever may be released from suchposition and allowed to be actuated by the spring 7 to open the draft ofthe heater at a predetermined time, the mecha nism for supporting thelever is connected with the alarm mechanism of an alarm clock, so thatthe lever is released when the alarm goes 0E. The alarm clock isindicated at 8, and is mounted in a compartment at the upper portion ofthe frame 1, and rests upon the transverse shelf 9. T he alarm clock isone of ordinary construction, of which the winding key attached to theend of the arbor connected with the mainspring of the-= time keepingmechanism is indicated at 10, the hand nut secured tothe end of the setting shaft at 11, the alarm setting dial at 12, and the alarm windingarbor which is connected with the mai-nspring of the alarm mechanism at13. A- stud 14 is secured to the end of the alarm winding arbor at theback of the clock, and an arm 15 pivoted to the stud 1a is arranged tosupport thelever 3 in its full line position, Fig. 1. The stu 14 isslotted at its forward end to form two arms 16 and 17, and the arm 15 isslabbcd off on each side to form an arm 18 which is received in the slotbetween the arms 10 and 17, and the arm 15 is pivoted to the stud 14 bymeans of a pivot pin 19. The outer ends of the arms 16 and 17 arerounded off on one side, as indicated at 20, and the inner end of thearm 18 is rounded off on the same side as at 21, so as to allow the arm15 to turn at an angle to the stud 14 to the side 011 which the arms arerounded off, as shown in Fig. 3. On the opposite side the arms 16 and 17present abrupt shoulders for engagement with the shoulders 22 on the arm15, and the end of the arm 18 presents an abrupt shoulder for engagementwith the end face of the slot between the arms 16 and 17, so that thearm 15 is prevented from swinging to that side of the stud. Thisconstruction forms what may be termed a one-way hinge connection betweenthe arm 15 and the stud 14, the arm being free to swing from a positionin line with the stud in one direction only with relation to the stud.The arm 15 is provided with a recess 23 to receive the lever 3.

In setting the device so that it will operate the draft controllingmeans of the stove or furnace to open the draft at a predetermined time,the alarm is set to go off at the time when it is desired that the draftbe opened, and the alarm is wound by turning the stud 14. The operatorat the end of the winding operation positions the stud 14 and arm 15 sothat the arm will not swing downwardly with relation to the stud, butwill be supported in alinement with the stud, as shown in Fig. 2. Thedraft operating lever 3 is then swung about its pivot to raise thelefthand end thereof (Fig. 1), and when the lever strikes the lower sideof the arm 15 the arm will swing upwardly to allow the lever to pass.When the left-hand end of the lever is swung past the arm, the arm willdrop down beneath it, and the lever is then allowed to rest in therecess 23 in the arm so that it will be supported in the full lineposition, Fig. 1, by the arm. The connector 4 is then connected with thedoor beneath the grate, or with any other draft controlling member ofthe heater which is set in position to close the draft. This completesthe setting of the device.

When the device has been set, as above described, and the alarm goesoff, the winding arbor 13 is turned by the action of the alarm mechanismspring until the stud 14 and arm 15 reach positions such that the armcan swing downwardly or in the direction of the action of the spring 7.When the parts reach these positions, the arm 15 swings at an angle tothe stud 14, releasing the lever 3, which is then actuated by the spring7 to open the draft of the heater.

To enable the length of the connector 4between the lever and the endthereof which is connected with the draft controlling means of theheater to be adjusted, a spool 24 is mounted for rotary adjustment onthe end of the lever 3, and the connector 4 is attached at one end tosaid spool. In orderto hold the spool 24 in adjusted position, atransverse pin 25 is secured in the end of the lever 3, and is arrangedto be engaged in either of the grooves 26 formed in the outer end of thespool 24. A. spring 27 coiled about the lever 3 is secured at one end tothe lever, and at the other end bears against the spool 24, therebyholding the spool in position with the pin 25 engaged firmly andsecurely in one of the grooves 26. The provision for adjustment of thelength of the connector 4-enables the device to be more convenientlyconnected in operative relation with the draft controlling means of theheater, and also enables the extent to which the draft is opened by thedevice to be varied readily. It will be noted that the de-' vice abovedescribed is simple and compact in structure, is composed of few partsso that it is not liable to get out of order, is self contained and maybe set up in connection with the heater merely by placing the device ina convenient position with relation to the draft controlling means ofthe heater, attaching the connector 4 to the draft controlling means,and adjusting the spool 24 to ive the proper length to the connector 4.flaving explained the nature and object of the invention, and havingspecifically described a device embodying the same in its preferredform, what is claimed is 1. A time controlled draft regulating devicefor stoves and furnaces, having, in combination, a draft controllingdevice, a movable member for operating the draft controlling device toopen the draft, a rotary stud, an arm pivoted to the stud to turnrelative thereto and arranged to support the movable member so'as toallow the draft controlling device to be closed in one position of thestud and to swing about its pivot and release said member when the studis rotated from such position, a clock, means controlled by the clockmechanism for rotating the stud at a predetermined time, and means foractuating the movable member to open the draft controlling device uponits release.

2. A time controlled draft regulating device for stoves and furnaces,having, in combination, a draft controlling device, a lever foroperating the draft controlling device to-open the draft, a rotary stud,an arm pivoted to the stud to turn relative thereto and arranged tosupport the lever so as to allow the draft controlling device to beswingabout its pivot and release said lever when the stud is rotatedfrom such position, a clock, means controlled by the clock mechanism forrotating the stud from such position to release the lever at apredetermined time, and means for swinging the lever in a direction toopen the draft controlling device upon its release.

3. A time controlled draft regulating device for stoves and furnaces,having, in combination, a draft controlling device, a lever foroperating the draft controlling device, an alarm clock, a stud connectedwith the winding arbor of the alarm mechanism, a lever supporting armpivoted to said stud to turn relative thereto and arranged to supportthe lever so as to allow the draft controlling device to be closed inone position of the arbor and to swing at an angle to the stud torelease the lever when the arbor rotates part of a revolution from. suchposition, and means acting on the lever to swing it in a direction toopen the draft controlling device upon its release by said arm.

4c. A time controlled draft regulating device for stoves and furnaces,having, in combination, a draft controlling device, a movable member foroperating the draft controlling device, a rotary stud, an arm forsupportin said movable member so as to allow the draft controllingdevice to be closed pivoted to the stud upon an axis transverse to theaxis of the stud and arranged to swing in one direction only from aposition substantially in alinement with the stud whereby said arm isenabled to support said member in one position of the stud and swing atan angle to the stud to release said member when the stud is rotated apart of a revolution from such position, a clock, means controlled bythe clock mechanism for rotating the stud from such position at apredetermined time, and means acting on said movable member to move itin a direction to open the draft controlling device upon its release bysaid arm.

5. A draft controlling device for stoves and furnaces, having, incombination, a

supporting frame comprising side plates, transverse plates connectingthe side plates, and a transverse shelf extending across the upperportion of the frame between the side plates and forming a compartmentabove the shelf, an alarm clock mounted within the compartment on theshelf with its rear face substantially perpendicular to the plates andshelf, a lever for operating the draft controlling device pivoted to theframe to swing in a plane adjacent to and substantially parallel withthe rear face of the clock, an arm carried by the alarm winding arborarranged to project across the plane of movement of the lever to supportthe lever and to be actuated to release the lever when the alarm goesoff, and means for swinging the lever to operate the draft controllingdevice to open the draft when the lever is released.

6. A draft controlling device for stoves and furnaces, having, incombination, a supporting frame comprising side plates, transverseplates connecting the side plates, a transverse shelf extending acrossthe upper portion of the frame, an alarm clock mounted on the shelf, alever for operating the draft controlling device pivoted to swing in aplane adjacent to and substantially parallel with the rear face of theclock, a stud secured to the rear end of the alarm winding arbor, an armpivoted to the stud on an axis transverse to the aXis of the stud,devices for holding the arm in sub stantial alinement with the stud soas to support the lever in one position of the stud arranged to permitthe arm to swing at an angle to the stud to release the lever when thestud is rotated part of a revolution from said position, and means forswinging the lever to operate the draft controlling device to open thedraft upon the release of the lever.

CAR-L H. CARROLL.

Witnesses:

BURTON W. CARY, C. M. SINOERBEAUX.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

